Determine Whether the Function Is Periodic $$f ( x ) = 8 \sin 2 x + 9 \cos 2 x$$

Multiple Choice

Determine whether the function is periodic. If it is periodic, find the period.
- $$f ( x ) = 8 \sin 2 x + 9 \cos 2 x$$

A) $2 \pi$
B) $\frac { \pi } { 2 }$
C) Not periodic
D) $\pi$